High temperature valve



April 28, 1942. s. J.- NORDSTROM HIGH TEMPERATURE 4VALVE: l

Original Filed Sept. 27, 1958 [UZZZ spezza www# Y s M /l Patented Apr. 2s, 1942 HIGH TEMPERATURE VALVE Sven J. Nordstrom, Lafayette, Cal

., assirnor to Merce Nordstrom Valve Company, Pittsburgh, Pa., a corporations! Delaware Original application September 27,

No. 231,906, now Patent No.

September 9, 1941.

tion October 21, 194

2 claims.

This invention relates generally to valves, in particlular to valves of the plug type. This is a division of my application flied September 27, 1938 for High temperature valve, Serial No. 231,906, Patent No. 2,255,182, granted Sept. .9. 1941.

It ls an object of the present invention to provide an improved valve plug seating means for resiliently holding the plug against its seat which will not lose its resiliency when subject to high temperatures or upon repeated deflection.

A further object is the provision of. resilient means having great rigidity for holding the plug against its seat which is protected from the corrosive and deteriorating action of the fluids passing through the valve.

A further object is the provision of a lubricated plug valve having a non-locking tapered plug and seat whereby the tendency of `the valve to stick is obviated.

Still another Objectis the provision of an improved valve plug seating means for resillently `maintaining the valve plug on its seat and adjusting the `seating pressure thereof which is compact in construction so that it may be applied to valves of small sizes, and which is inexpensive to manufacture.

In accordance with the present invention, I provide a lubricated plug valve having a separate operating stem which is separately sealed, and at one end of the plug I provide resilient thrusting means comprising a plurality of spring lmetal disks or plates arranged so that they may be deformed to transmit a resilient thrust to the plug. The washers preferably are located in a recess in the valve cover closing the end of the plug seat and are sealed with respect to line fluid by a flexible corrosion resisting metal diaphragm o f suitable construction, the resilient thrust being valve plug in any suitable manner. I prefer to transmit the thrust by means of a thrust button located on the opposite side of the sealing dlaphragm and a ball interposed between the thrust button and the plug whereby frictional resistance to turnlngis reduced and there is no tendency of the button to rotate. The deformable washers and the thrust button preferably have fiat faces engaging the diaphragm to avoid localized wear or danger of perforating the diaphragm. The

resilient thrust of the` washers preferably is ad justed by a threaded plugextending through the cover and abutting the washers so that by turnlng the plug in one direction the washers are transmitted through the diaphragm to the means of a screw 2| deformed and by turning the plug in the reverse 55 1938l Serial 2,255,182, dated Divided andthis applica- 0,-Serial No. 362,025

direction the washers tend to resume their original fonn. The preferred form of washer has a substantially hat surface abutting the sealing diaphragm and has a peripheral raised rib on the other surface against which a flat Washer abuts, the deecting thrust of the threaded plug being exerted against the dat washer to bow it at its center. However, any desired form of resilient washer may be employed. -The angle of taper `a valve incorporating the preferred embodiment of the present invention, and

Figure 21 is a transverse section taken on line IIII of Figure 1.

Referring to Athe drawing, the valve comprises a body or casing I0 having a longitudinal passageway II therethrough foriflow of fluid, said casing having flanges I 2 adjacent the ends of the passageway whereby the-valve may be connected into a uid pipeline. A tapered bore or seat i3 is formed in the casing transversely of the passageway, ing at the larger end of the tapered bore. A tapered plug I I is seated in the seat I3 and has a lport I5 therethrough adapted to register with the passageway II in full open position of the valve. Preferably the taper of the plug and seat is 12, that is, the wall makes an angle oi"A 6 with the axis of the plug on each side.

At the smaller end of the valve seat the casing I 0 has an extension I6 into which is threaded an operating stem I 'i plug and forms an operative connection therewith at the smaller end of theplug through a modified Oldham coupling I8 or the like. A lubricant chamber I9 is formed at the smaller end of the plugl and lubricant is supplied thereto` through a threaded bore 20 extending through 'the valve stem I'I, the lubricant in bore 29 and chamber `I9 being placed under compression by threaded into the bore 20. One or more check valves 22 of suitable construction are provided in the bore 20 to prevent wherein is shown by way of example a prel and extends to the exterior of the cas-A which is separate from the phragm 2t preferably ismade of a stainless steel -10 or other suitable corrosion resisting material and is sufficiently thin so that it may be flexed. The cover 23 may be made of cast steel or diefcrged steel or of any other suitable material, and pref erably is constructed thick enough so that it will l5 not be appreciably flexed by the line pressure or the reaction of the seating thrust on the plug. e. conical recess 2l is formed in the larger end of the plug and receives a ball 2t which is made of hard steel or other suitable material, and a :zu thrust button 29 is interposed between the bore l2i andthe diaphragm 26 for transmitting the seating thrust to the plug. vThe plug thus may be turned without turning thrust button 2d.

Preferably there is a hole 3u connecting the port. 25

of the plug with the space at the larger end of the seat.

The cover 23 has a central threaded bore 3i therein which is counterbored at 32 and receives in the counterbore a plurality of thrust members 3u 33, 3d and di. The member 33 preferably has a fiat surface engaging the diaphragm 33, and has a peripheral bead 3d on its opposite surface.

The washer 3d preferably is iiat and its periphery rests upon the bead 36 of washer 33, the center 35 portion of washer 3d being without support so that the washer may flex in its center when pressure is exerted thereon. Ii desired, a third disk 35 may be provided having a thickened central portion 31, and a pin tt engages the center pori0 tion of disk 35 and is received in a central recess 3 formed in the inner end of threaded plug di. The washers or disks 35i andi preferably' are formed of spring steel or other resilient metal so as to have the desired resiliency and strength. 45

The threaded plug i i may be locked in position by means of an internally threaded cap 42 which abuts a sealing gasket d3 and prevents leakage should the diaphragm 2t be accidentally ruptured. If desired, the cap 2 may be spot Welded. 50

to the cover.

The preferred lubricating system for the valve comprises a circumferential groove l5 in the casing in the smaller end of the seat, which com- Amunicates at all times with the chamber i9 by 55 means of short connecting grooves It. A circumferential groove dl is formed at the larger end of the seat. The plug ill has four longitu dinal grooves 68 which are disposed diametrically opposite in pairs and on opposite sides` of the co port it, and four extensions 52 of the circumferential 'groove 45 communicate with the longitudinal grooves 4'8 -in full open and full closed positions only of the valve plug. At theopposite end, the circumferential groove i1 has extensions 65 56. which likewise communicate with the longitudinal grooves 48 in full open and .full closed positions only of the plug. If desired, circumferential grooves 6l and 62 may be provided at.

opposite ends of the plug and opposite the cir- 70 cumferential grooves d6 and tl in the casing in order to enable the plug to be lapped into its seat without raising a ridge on the seating surface.

The operation pf the valve will now be de- 75 scribed. In order to'lubricate the valve. a quantity of lubricant,l preferably in stick form, is inserted in the threaded bore 20 and is forced by screw `2i through the bore 20 into'the chamber i@ and by connecting grooves 48 into the overlapping circumferential grooves 6! and 45. By means of the short connecting grooves B2 lubricant is conducted grooves d8 and by means of the connecting grooves 56 lubricant is conducted from longitudinal grooves d8 into the overlapping circumferentlal grooves 62 and d1. In closed and opened positions of the valve the passageway it is surrounded at both ends by closed circuit of lubriu cant grooves, and-in intermediate positions the grooves it are alldisconnected from the source of lubricant under pressure in chamber iif By reason of the foregoing arrangement of lubricant grooves, the valve can be moved lon=1 gitudinally against the resilient force of washers 33, 3d and 35 in any position of the plug. In positions where any of the longitudinal grooves .tid are exposed to line fluid, as for ex ample, when the valve is rotated between open be washed out of the lubricant system for the' valve when the plug is left with any of the grooves therein exposed.

The seating thrust on the plug may be adjusted by adjustment of threaded plug M When the plug il is turned inward it forces pin t@ against washers 3d and 35 at their center, causing them to be bowed or deflected, the peripheries being free to allow such action. The re silient thrust of the peripheries of these washers is transmitted through the rib 36 and diaphragm '26 against the thrust button 29, which in turn transmits the seating thrust to the plug through the thrust ball 2t. When it is desired to relieve the thrust on the plug the threaded plug 4l is turned outwardly, thus relieving the deforming force exerted on washers 3d and 35 so that pressure within the casing forces the plug toward the larger end as far as is permitted by the thrust transmitting means.

As the cover 23 requires bolt holes and therefore cannot be made of spring steel, this construction permits the use of strong spring steel washers 33, 3d and 35 for maintaining the plug on its seat, no machining being required in making the washers. If desired. the rib 36 may be separate from the washer 33.

The invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof, and therpresent preferred embodimentAis, therefore, to be considered as illustrative rather than restrictive of the invention.

What I claim as my invention and desire to secure by United States Letters Patent ls:

l. A valve comprising a casing having a passageway therethrough and a tapered valve seat formed transversely of the passageway, a cover having a central opening secured to the casing -for closing the larger end of the seat. a tapered plug seated in the valve seat and having a. hole adapted to register with the passageway, a separate operating stem passing through the casing in sealing relation thereto and engaging the smaller end of the plug, a sealing diaphragm interposed between the valve cover and the casinto the longitudinal ing, a plate having a substantially'at surface engaging'said diaphragm and having a raised periphery on the opposite side, inherentiyresilient spring metal washers in said central opening supported at their peripheries by the raised Y periphery of said plate, means on lthe opposite side of the diaphragm for transmitting the'thrust of said washers against the plug. and means in the cover for defieeting said washers to force 'the plug into its seat. n

2. A valve comprising a easing having a pas sageway therethrough and a tapered'valve seat formed transversely of the passageway, a tapered plug seated inthe valve seat and harina a port adapted to register with the passagewarD casing for closing the larger end of the valve seat, a sealing diaphragm clamped, between the j cover and the easing, a plate having-a` substantiaily lflat surface engaging said diaphragm and having a raised periphery on the opposite side. a pluralitylof steel spring washers supported at their perpheriesinsaid opening by the raised periphery of said plate, a threaded plug in said opening bearing on the centers of said Washers and deforming said washers to force them against the diaphragm, and thrust transmitting means l on the opposite side of the diaphragm for transmitting the thrust of the Washers to the plus.

SVEN J. NORDSTROM.

a cover having a central opening secured-to the 

